<?php


class CaptchaSecurityImages {

	var $font = 'components/com_redshop/assets/captcha/monofont.ttf';

	function generateCode($characters) {
		/* list all possible characters, similar looking characters and vowels have been removed */
		$possible = '23456789bcdfghjkmnpqrstvwxyz';
		$code = '';
		$i = 0;
		while ($i < $characters) {
			$code .= substr($possible, mt_rand(0, strlen($possible)-1), 1);
			$i++;
		}
		return $code;
	}

	function CaptchaSecurityImages($width='120',$height='40',$characters='6',$captchaname='security_code') {
		$session =& JFactory::getSession();

		$code = $this->generateCode($characters);

		if($captchaname=='pri_security_code'){
			//$session->set('pri_security_code','');
		   //	$session->set('pri_security_code',$code);
			setcookie('pri_security_code',$code);
			//echo $_SESSION['pri_security_code'] = $code; exit;
		}else{
			//$session->set('security_code','');
			//$session->set('security_code',$code);
			setcookie('security_code',$code);
		}
		/* font size will be 75% of the image height */
		$font_size = $height * 0.75;
		$image = @imagecreate($width, $height) or die('Cannot initialize new GD image stream');
		/* set the colours */
		$background_color = imagecolorallocate($image, 255, 255, 255);
		$text_color = imagecolorallocate($image, 20, 40, 100);
		$noise_color = imagecolorallocate($image, 100, 120, 180);
		/* generate random dots in background */
		for( $i=0; $i<($width*$height)/3; $i++ ) {
			imagefilledellipse($image, mt_rand(0,$width), mt_rand(0,$height), 1, 1, $noise_color);
		}
		/* generate random lines in background */
		for( $i=0; $i<($width*$height)/150; $i++ ) {
			imageline($image, mt_rand(0,$width), mt_rand(0,$height), mt_rand(0,$width), mt_rand(0,$height), $noise_color);
		}
		/* create textbox and add text */
		$textbox = imagettfbbox($font_size, 0, $this->font, $code) or die('Error in imagettfbbox function');
		$x = ($width - $textbox[4])/2;
		$y = ($height - $textbox[5])/2;
		imagettftext($image, $font_size, 0, $x, $y, $text_color, $this->font , $code) or die('Error in imagettftext function');
		/* output captcha image to browser */
		ob_clean();
		header('Content-Type: image/jpeg');
		imagejpeg($image);
		imagedestroy($image);
		exit;

		//$session->clear($captchaname);
		//$session->clear('pri_security_code');
		//$session->set( $captchaname, $code );
		//$_SESSION['security_code'] = $code;
	}

}



?>